PLEASE HELP ASAP - ILL GIVE BRAINIEST

We know that:

Factorize the expression for the area and find the missing side

Given:

Find l:

l = A/w

l = (x² + 10x + 21)/(x + 3) =

    (x + 3)(x + 7)/(x + 3 =

    x + 7

Given:

Find w:

w = A/l

w = (x² + 2x - 8)/(x + 4) =

      (x + 4)(x - 2)/(x + 4) =

      x - 2

false.

step-by-step explanation:

false.

cavalieri's principle makes that statement about the volumes, not about the areas.

step-by-step explanation: 4 cause 2+2=4